jupiter-moons-compared-to-earth...

http://i1.wp.com/www.everydaysciencestuff.com/wp-content/uploads/2013/07/Jupiter-size.png-
http://pics-about-space.com/jupiter-moons-compared-to-earth?p=3

http://www.geol.umd.edu/~jmerck/geol212/lectures/21.html

http://coolcosmos.ipac.caltech.edu/page/jupiter_saturn

http://lasp.colorado.edu/education/outerplanets/giantplanets_interiors.php